Personally, I think one can take the libertarian position on the issue without knowing or claiming to know much about the science involved. But it seems Barr has taken a different approach.
On the Glenn Beck show, in early June, Barr said, "Global warming is a myth. And yet it`s being used by the environmental folks, by the internationalists. A lot of the pressure is coming from the United Nations and other countries. Some of which, like China, of course, are pushing the Kyoto Protocol. Why? Because they`re exempt. It`s going to saddle us. And what is McCain doing? He`s out there buying into this global warming, carbon emission cap and trade."
Now Barr says, "Former Vice President Al Gore and I have met privately to discuss the issue of global warming, and I was pleased and honored that he invited me to attend the 'We' Campaign event. Global warming is a reality as most every organization that has studied the matter has concluded, whether conservative-leaning, liberal oriented or independent."
He gives the caveat that he is "aware that scientists differ on its causes, impact and remedies" and is "firmly committed to free market solutions and innovations to address this issue; not tax-driven policies."
But although he calls his solutions "market-based" and "free enterprise":
"There obviously is a role for government," Barr said. "There's a role for private industry. There's a role for nonprofits and certainly a role for the American people, individually and collectively". . . . [Barr] said it is time to recognize that global warming "is a very serious problem" and that it will get "dramatically worse" unless significant action is taken.